Abstract
The thermal deformation and dynamic recrystallization (DRX) behavior of a nickel-based superalloy were investigated by the thermal compression test. The experimental results show that the process parameters have great influence on the flow stress of the superalloy. In addition, there is an inflection point on the DRX softening stage of the work-hardening rate versus stress curve. DRX under the conditions of higher temperatures and lower strain rates easily occurs when the strain reaches a critical level. Based on the classical dislocation density theory and the DRX kinetics models, a two-stage constitutive model considering the effect of work hardening-dynamic recovery and DRX is developed for the superalloy. Comparisons between the predicted and experimental data indicate that the values predicted by the proposed constitutive model are in good agreement with the experimental results.
Highlights
Superalloys can be divided into three categories according to the matrix: nickel-based superalloy, cobalt-based superalloy, and iron-based superalloy
The development of numerical simulation technology has promoted the successful application of the finite element methods to a great extent, and it has been widely used in the analysis and optimization of materials forming processes [4,5,6]
In order to establish a finite element simulation model, the constitutive model of materials has been considered as an input code to simulate the deformation behavior of materials under specific loading conditions [7]
Summary
Superalloys can be divided into three categories according to the matrix: nickel-based superalloy, cobalt-based superalloy, and iron-based superalloy. The latter has better comprehensive mechanical properties at high temperature, so is widely used in many fields, such as aerospare, navigation, nuclear energy, petroleum, etc. The development of numerical simulation technology has promoted the successful application of the finite element methods to a great extent, and it has been widely used in the analysis and optimization of materials forming processes [4,5,6]. The accuracy of numerical simulation is heavily dependent on the consistency between the actual deformation behaviors of materials and those predicted by a constitutive model
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